Mining machine



18, 1931. M. P. HOLMES MINING MACHINE Original Filed Feb. 20, 1924 6 Sheetsh t l MINING MACHINE Original Filed Feb. 20, 1924 6 Sheets-Sheet 2 .v Mw 3 3 3 M I J i s o lgwwmw l mm LNWW w igx @w v 3 O. O O 0 v a H m z w w w Q /m n Q 5 g w g; QQ

Aug. 18, 1931. M. P. HOLMES MINING MACHINE Original Filed Feb. 20, 1924 6 Sheets-Sheet 3 Aug. 8, 931. M. P. HOLMES 1,819,778

MINING MACHINE Original Filed Feb. 20 1924 6 Sheets-Shet 4 ii 7720 w'sP a Aug. 18, 1931. M. P. HOLMES MINING MACHINE 6 Sheets-Sheet 5 RN 1 Q Q? Original Filed Feb. 20, 1924 I. 7 I I 77Za M MWMWW 1 QQQQQQWWW'Q M. P. HQLMES MINING MACHINE 6 Sheets-Sheet 6 ori inal Filed Feb. 20, 1924 E NE. W

Patented Aug. 18, 1931 UNITED STATES PATENT OFFICE MORRIS P. HOLMES, F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS MINING MACHINE Application filed February 20, 1924, Serial No. 694,139. Renewed September 29, 1930.

My invention relates to mining machines.

An object of my invention is to provide an improved mining machine. Another object of my invention is to provide an 1mproved mining machine of the so-called unlversal type. A further object of my invention is to provide a mining machine having improved and simplified adjusting means for the cutting mechanism forming a portion thereof. A still further object of my inven-- shown for purposes of illustration one form' which my invention may assume in practice.

In these drawings, I 9

Fig. 1 is a plan view of a mining machine constructed in accordance with the illustrative form of my invention, the cutter bar being partially broken away and shown 80 in a position in alinement with the major dimension of the machine.

Fig. 2 is a side elevation of such a machine with parts similarly broken away.

Fig. 3 is a vertical section on a plane corresponding to the line 33 of Figs. 1 and 4 showing details of the bar adjusting mechanism.

Fig. 4 is a horizontal section one plane j m corresponding to the line 4-4.- of Fig. 3.

Fig.6 is a section on an enlarged scale on a plane'corresponding to the line 55 of Figs. 3 and 4. v

Fig. 6 is a horizontal section showing a portion of the bar adjusting mechanism, transmission mechanism, etc. I

Fig. 7 is a section approximately on a plane corresponding to the section line 7--7 of Fig. 6.

Fig. 8 is a detail sectional view on a plane corresponding to the line 88 of Fig. 6.

Fig. 9 is a sectional view on a plane cor-' responding to the section line 9--9 of Fig. 7

Fig. 10 is a detail sectional view showing a locking mechanism.

Fig. 11 is another sectional view of this same mechanism, the view being taken on the broken line 11-11 of Fig. 10.

Fig. 12 is a section on the plane corresponding to the line 1212 of Fig. 1.

Referring firstto Figs. 1 and 2 and in order that a general concept of the illustrative form of the invention may be obtained as quickly as possible, it may be stated that the apparatus as a Whole comprises a truck consisting of a truck body 1 mounted on wheels 2 and adapted to be propelled along a trackway 3, upon which truck is mounted mining mechanism generally designated M and including a motor casing 4, a gear housing 5, a cutter bar 6, and supporting and adjusting mechanism for the cutter bar generally designated 7, which mechanism I shall hereinafter more fully describe. In order to permit a moderate angular adjustment of the mining machine M as a whole about a transverse horizontal axis the following mechanism is provided.

It will be observed that the mining machine M is supported upon a platform 8 which is composed of a pair of parallel side members, herein angle irons 9, and suitable transverse portions, ofwhich one is shown at 10. Each of the members 9 carries secured thereto projecting bearing members 11 which are adapted to seat upon and cooperate with projecting cylindrical members 12 bolted as at 13 to the lateral portions 14 of the truck body 1. These members 12 have flattened portions 12' which rest upon the frame 14 so that the bolts do not have tilted and will be well supported. For the purpose ofeffecting tilting of the mechanism M about the 'ournal members 12, there is providedupon t e truck frame in suitable journals 15 a transverse shaft 16 to which at opposite sides of the center thereof but closely adjacent each other there are secured a air of similar arms 17 which are connecte at their free ends by a bolt 18 upon which there are rotatably mounted rollers 19. These rollers are arranged in slots or guideways 20 formed in members 20 which are secured to the bottom of the machine mechanism itself. From Figs. 7 and 9 it will be noted that when the machine frame is in its horizontal position the arms 17 are not vertical but inclined so that on swinging movement of the shaft 16 and resultant swinging of the arms 17 the rollers 19 traveling within the slots 20 may cause a tilting movement of the machine frame as a whole. Within reasonable limits this tilting movement maybe. in either direction about the horizontal axis. For the purpose of rocking the shaft-16 and holding it in different angular positions, an arm 21 is secured by keying or in any other suitable manner to one end thereof and with this arm there cooperates arm swinging means comprising an arm engaging member 22, which is threaded throughout a considerable portion of its length as indicated at 23, supported in suitable horizontal guides 24 and adapted to be moved longitudinally upon rotation of a nut 25' which engages the threaded portion 23, which nut may be rotated by a hand operated ratchet and pawl mechanism 26. It is to be observed that depending upon the direction in which the nut 25 is turned, the arm 21, and so the arms 17, will beswung in opposite-directions and the machine frame either tilted from horizontal or brought back to horizontal position, it-being moreover observed that the guides 24 are rigidly connected to the frame 8 so that as tilting of the frame occurs and as movement of the arm 21 takes place, there will be no binding at the connection between the member 22 and the arm 21. The mechanism so far described in relation to the tilting devices is very closely similar to that disclosed in my application Ser. No.- 573,149, filed July 6, 1922.

The motor casing 4 contains a motor (not shown) which is supplied with current through a reeling device 30 described in a previously filed application, the motor bein herein reversible and provided with sultable controlling and reversing mechanism of any suitable construction. The motor as usual comprises an armature shaft which is herein designated 31 and this shaft projects through the opposite ends of the motor casing 4 and operates to transmit power for the driving of the cutting mechanism, for the changing of position thereof and for the feeding of the machine as a whole both during cutting and in running around a mine. The rear end of the armature shaft which is designated 32 is provided with a spur pinion 33 that meshes with a spur gear 34 keyed or otherwise suitably secured to a horizontal longitudinally extending shaft 35 "on which a worm 36 is arranged. Theworm 36 meshes with and drives a worm wheel 37 mounted upon a transverse hollow shaft 38 and under the control of a suitable friction controlling mechanism 39 of well known construction effects the drive of a driving sprocket 40 Whose .position is indicated in Figs. 1 and 2. It will be understood that this sprocket may be driven in either direction depending upon the direction of rotation of the shaft 31, or, at the will of an operator and on suitable manipulation of the friction mechanism 39, permitted to rotate when disconnected from the shaft 38. A suitable 31 is designated 45 and has connected there- 1 to a sleeve 46 which is provided with a driving pinion 47. This pinion meshes with and drives a larger spur gear 48 which is carried upon a horizontal longitudinally extending shaft 49 which is suitably journaled as at 50 and 51 in the machine frame. At its forward end the shaft 49 carries a bevel pinion 52 which meshes with and drives a pair of coaxial oppositely facing bevel gears 53, 54. The latter are connectible by friction clutch mechanisms of a Well known form, which are generally designated 55 and 56, alternati'vely with a transverse horizontal shaft 57. A suitable shipper mechanism-58 carried by a hollow horizontal transverse sleeve 59 -is normally held in neutral positions by oppositely acting springs 60 arranged between adjustable collars 61 and collars 62 engaging the ends of the sleeve 59. \Vithin the sleeve 59 is a shaft 63 having shoulders 64 adapted to engagethe collars 62 on longitudinal movement and to free the sleeve of the influence of one or the other of the springs 60. The shaft 63 is movable by the interaction of a rack 65 and gear segment 66 inv a manner to effect control of the clutches 55 and 56 and so the alternate connection or the complete disconnection of the gears 53 and 1 from the-shaft 57. The

segment 66 is controlled by a hand lever 67 68 which meshes with a worm wheel 69 upon a collar 70 which is keyed to a horizontal longitudinally extending shaft 71 arranged below and to one side of the axis of the armature shaft. Obviously reverse rotation of the shaft 71 is effected by reverse rotation of the shaft 57. The shaft 71 is supported in suitable bearings 72 and 7 3 formed in the gear casing 5 and the shaft carries adjacent the latter of these bearings, and to the rear of the worm wheel 69, a worm 75 which meshes with and drives a worm wheel 76 rotatably mounted on a transverse horizontal shaft 77 journaled as at 78,78" in the gear casing 5. Suitable clutch mechanism indicated by 79 is provided for the purpose of connecting the worm wheel 76 to the shaft 77, this in the illustrative form shown being of the so-called Fellows type' of clutch. The shaft 77 projects through the side wall of the gear casing-5 and has geared thereto a driving sprocket'80. The clutch mechanism 79 is operable by a handle 81 disposed upon the top of the gear casing and adapted to be secured in either of its positions by any suitable means. This mechanism just described is also substantially the same as that described in my earlier filed application mentioned above. 7 a

The truck wheels 2 are mounted upon axles 82 which extendv completely across the truck body 1. The rear axle 82 is provided with a pair of sprocket wheels numbered respectively 83 and 84, the wheel83 being arranged at that side of the truck body at which the sprockets 40 and 80 are to be found. The forward axle 82 has secured thereto a sprocket 85 and a chain 86 coop crating with the sprockets 84 and 85 connects the axles for simultaneous rotation} in the same direction. For the purposeof maintaining the chain 86 in proper tension, an eccentrically mounted adjustable idler sprocket 87 of the type described in my above mentioned application is provided. A driving chain 88 passes, as best shown by dotted lines in Fig. 2, around the sprockets,

40 and 80 and around the sprocket 83 upon the rear axle 82, it being also observed from' the structure.

the r sprocket 89 which is best shown in Fig.

9 and which is adjustable in position to vary the tension of the chain. The adjusting mechanism for this sprocket whichpresents certain features of novelty over my prior application, is of such nature as to permit adjustment of two types, one an initial adjustment to providea'proper chain tension and the other-an adjustment which accompanies a tilting of the mechanism so as to keep the chain under proper tension notwithstanding a tilting about the axis of the members 12. The sprocket 89 is journaled upon a shouldered sleeve 90 which cooperates with a circular member 91 having a flange 92 clamping a stationary circular bearing member 93 carried upon the extremity of an arm 94;.

A- stud 95 is threaded into the member 91 'not concentric with the portionofthe member which isrotatable inthe member 93, it will be evident that the member 90 may so move as to provide more slack or to tighten the chain '88. The arm 94 ismounted upon the shaft 16 .at the opposite end of the latter from the arm 21 and upon tilting of this shaft in a direction to raise the right handend of the mechanism in Fig. 1, it. will be observed that the arm 94 swings in, such direction as'to cause a slackening 1n the chain thereby maintaining the tension of the chain substantially constant. A reverse effect of course accompanies an opposite tiltmg. 1

It seems advisable to set forththe operation of the mechanism so far described before providing any further description of It will be evident that during running around a mine it is immaterialwhether the cutter chain. runs at all or what direction it runs in, although it is preferable that it does not run at all, as is the case herein by reason of structure which will shortly be described. It is accordingly possible to reverse the motor and so to reverse f end of the armature shaft by way .of the pinion 33, gear 34, Worm 36, worm wheel 37 and shaft 38 with the driving sprocket 40 and so effect the running of the machine at a relatively high rate of speed about the mine. When it is desired to cutand feed the machine during cutting it is obvious that unless the cutter bits are to be shifted, the motor must run continuously in one direction unless, of course, reversing mechanism with its additional complication is provided in the cutter chain driving train. Accordingly it must be possible, if sumping and withdrawing cuts are to be made, to reverse the direction of movement of the machine without reversing the motor. For this reason I have provided reversible driving mechanism including the clutches 55 and 56, etc, and so am able to reverse the direction of rotation of the driving sprocket 80. at will while maintaining the direction of rotation of the armature shaft 31 unchanged. If it is desired to effect bodily movement of the machine in one direction, then to maintain it stationary, and then to move it bodily in the opposite direction, the steps necessary will include the operation of whichever one of the clutches 55 or 56 are to be thrown into engagement to effect the desired initial direction of feed, thereafter to disconnect both of the frictions 55 and 56 while leaving the clutch mechanism 79 engaged (in which position of the parts the worms will lock the sprocket 80 against rotation) and then to en-. gage the otherof the clutches 55 and 56. By reason of the plurality of worms, etc., it will be evident that the speed during cutting will be much less than during running about the mine. As the mechanism so far described is, with the eirceptions noted, very closely similar to the disclosure of my earlier filed application, it is believed that it is not necessary to go into greater detail inthe delinearly, and mechanism for swinging the bar is also provided. For the purpose of supporting the cutting mechanism there is provided upon the front end of the frame section 5 an annular seat 100 to which is secured an annular sleeve or retaining and bearing member 101 having an inwardly directed flange 102. Between the flange and the shoulder 103 also formed upon the front end of the frame member 5, there is rotatably secured a sleeve 104 which is fastened by bolts 105 or in any other suitable manner to a projecting neck member 106, it being possible to construe the member 106-and the sleeve 104 as together making up a neck if desired. The member 106 also has herein formed integral with it a pair of parallel portions 107 to which guideways hereinafter described are secured, these members being connected adjacent their lower ends by a transverse web 108 and being connected by webs 109 to the right hand end of the neck member 106 while curved webs 110 serve to connect them with the generally circular to the lower end thereof an annulus 116 which together with an annular shoulder 117 upon the member 115 provides a guideway for a large internal gear 118 to which there is secured asat 119 a casting 120 which carries the cutter bar 6 of the machine and which also constitutes a guard for the cutter bits. 1

For the purpose of effecting rotation of the neck 106 and with it bodily movement of the cutter bar about the axis of the armature shaft, I have provided means driven from the shaft 71 and consisting of a spur gear element 121 coaxial with which there is a second spur gear element 122 held as at 123 to a shaft 124 which is journaled at its rear end 125 within-a recess 126 in the shaft 71 while at its forward end it carries a spur pinion 127 which meshes with the internal gear 104, the front end of the shaft 124 being .journaled as at 126 in the front end of the gear casing. A clutch sleeve 128 is movable in opposite directions by a shipper mechanism 129 whoseoperatinghandle 130 is arranged upon the top of the casing 5. By oscillation of the handle 130 it will be evident that the clutch element 128- may be moved in such manner as to connect the gears 121 and 122, which 'will cause the shafts 71 and 124 to rotate together and so will cause rotation of the internal gear 104 and of the neck 106. This will cause bodily movement of the cutter bar about the axis of the armature shaft extended. It will be noted that for the purpose of locking the neck in different adjusted positions there is provided a locking rack element 131 carried upon and pivoting about a shaft 131 to which there is secured a member 132 which carries upon a pivot 133 a hand lever 134, the hand lever being capable of swinging movement transverse to the plane of rotation of the member 132 so as to release a latch 135 from notches 136, there being a s ring 137 which operates, however, normal y to hold the latch in the notch.

To recapitulate, it may be stated that to effect iotation of the neck and so bodily movement of the cutter bar about the extended axis of the armature shaft, the looking rack 131 will be moved out of engagement with the internal gear 104 by movement of the hand lever 134 first to release the latch and thereafter to swing the element 130 out of engagement with the teeth of the internal gear and thereafter, the clutch member 128 connecting the shaft 124 to the shaft 150 which is, however, rotatabl 71 so that the pinion 127 will rotate the internal gear 104 and with it the neck, the proper friction clutch 55 or 56 may be engaged to cause the desired movement. When the desired position of adjustment is reached, the friction clutch will be unloaded and before the clutch 128 is disengaged from the member 121 the member 131 will be reengaged with the teeth of the internal gear 104. a

As a preliminary to a further description of the cutting mechanism, it should be observed that a shaft 140 is arranged in alinement with the armature shaft 31 and is keyed within a member 140 which is non-rotatably secured to the member 46 carrying the driving pinion 47 the parts constituting a flexible coupling. This shaft 140 extends through the neck and at its forward end carries a bevel pinion 141 which meshes with and is adapted to drive a large bevel gear 142 rotating upon a vertical axis. The gear 142 is enclosed in a housing including the portion 111 integral with the neck and a cover member 143, suitable bearings 144 being provided, and within these bearings there being 'ournaled a tubular member 145 to which t e gear 142 is connected by a spider member 146 which is keyed as well as bolted to the member 145. At its lower end the member 145 carries a series of threads 147 which make up a nut and cooperating with this nut is a long heavy screw 148. This screw at its lower end is provided with a reduced portion 149 and carries at its extreme lower extremity a cutter chain driving sprocket I mounted with respect to the portion 149, eing held, however, against downward movement with respect to the latter by a member 151. Just above the reduced portion '149 there is a collar 152 which may be left in the ma-. chining of the screw member 148 and this collar engages one element 153 of a large ball thrust bearing, while upon the other element 154 of this bearing there rests an annulus secured to a cover member 155 which goes, together with the member 115 and a closure and journal member 156, to make up a casing housing the mechanism for driving the cutter bar and swin ing the same. The lower side of the mem er 153 is engaged b a shoulder 174' on a member 174, hereina ter more fully described, which member is held against longitudinal movement relative to the portion 149 by engagement with a split or two part collar 152 engaged in a groove in the portion 149. The lower'part of the element 154 is held by suitable holding and locking means 154' in fixed space relation to the-housing 155. As a result of this construction, the weight of the parts is suspended from the screw whether the position is as shown or inverted.

A cover late 157 surrounds the screw and is provi ed with a recess 158 in which a felt ring or other means for preventing the access of dirt is housed.

Referring to the mechanism within the casing made up of the parts 11 and 143, it will be noted that within the member 145 is a sleeve 160 provided with inwardly projecting splines 161 which engage in grooves 162 extending longitudinally of the member 148 so that so long as the member 160 is held against rotation the screw 148 is also maintained stationary in so far as rotation upon its axis is concerned. The member 160 carries at its upper end a member 163 splined thereto as at 164 and having spur teeth 165 projecting about its periphery. The member 145 has corresponding spur teeth 166 and a third set of similar spur teeth 167 is carried upon a depending portion of a member 168 secured to the member 143. A clutch member 169 having slots adapted to cooperate with the teeth 165, 166 and 167 is vertically reciprocable at the upper,end of the member 160 and when in the position shown in Fig. 3 serves to connect neither the teeth 166 nor the teeth 167 to the teeth 165, but on downward movement connects the teeth 165 and 166 in such manner that the screw and the nut rotate together while on upward movement it connects the teeth 165 and 167 so that the sprocket150 is a sleeve member 171 having radially projecting clutch teeth 172 with which a clutch member 173 cooperates. The member 171 is connected in non-rotative, relation to the cutter chain driving sprocket 150. Surrounding the uppermost portion of thereduced portion 149 is a sleeve 174 which carries at its lower end a series of teeth 175 similar in dimension and arrangement to the teeth 172 upon the sleeve 171. On up ward movement of the clutch from the position shown in Fi 3, it will be evident that the teeth 172 an 175 will be connectedtogether and so since the sleeve 174 is connected by a key 176 to the portion 149 of the member 148, rotation of the member 148 member 148. A clutch shipper 179 is pivoted at 180 in the lower housing mentioned above and has a rocker arm 181 with which a lever 182 cooperates for the purpose of effecting raising and lowering of the clutch member 173. The arm 182 is keyed to a shaft 184 which projects laterally through the casing and a lever 185 shown in Fig. 4 is provided to effect the movements of the clutch member. Suitable means 186 is provided for the purpose of controlling the movement of the clutch 169.

Surrounding the sleeve 174 and keyed thereto as at 188 is a spur gear 189 which will be noted in Fig. 4 to mesh with a pair of spur gears 190 and 191 arranged on vertical shafts and connected to vertically disposed oppositely threaded worms 192, 193 respectively. These worms in turn are connected in driving relation with a pair of worm wheels 194 and 195 which are arranged as is indicated in the case of the worm wheel 194 in Fig. 5, upon a transversely extending shaft 196. The shaft 196 carries rigidly secured thereto a worm 197 which meshes with a worm wheel 198 upon a vertical shaft 199 journaled in the frame and carrying at its lower end a pinion 200 which meshes with the internal gear 118. It will be, obvious that rotation of the worm wheel 199 and so of the pinion 200 will effect bar swing. At this point it should be noted that the lead of the worms 192 and 193 is different as well as the threads being opposite, these bein proportioned to provide fast bar swing or positioning and slow bar swing for cutting.

As a result of this construction when the worm wheel 194 is acting as the driving worm for the shaft 196, bar swing will take place at one rate in one direction while when the worm wheel 195 is the drivin element, bar swing will take place at a di erent rate intheo posite direction, the swing during cutting; ing at a substantially slower rate than the swing during positioning of the bar. For the purpose of connecting the worm.194 to the shaft 196, mechanism is provided as shown in Fig. 5, and it will be understood that correspondmg mechanism is provided for connecting the worm 195 to the shaft 196. It will be observed that a friction clutch housing member 205 is keyed to a reduced portion of the shaft 196 as by a key 206. Within this housing and con-' nected thereto by splines 207 are a series of friction discs 208. The worm wheel 194 is bolted to a hub or sleeve member 209 which carries a series of splines 210 with which-a series of friction discs 211 are connected, these discs being'arranged in alternate relation with the discs 208. It will be evident that when the discs 208 and 211 are pressed into engagement with each other, there will be a clutching of the worm wheel 194 and the shaft 196. For the purpose of pressing the parts into engagement a series of friction applying fingers 212 are arranged through openings 213 in the housing member 205. Coaxial with the shaft 196 is a member 215 having a flange 216 adapted to engage the fingers 212 and cause them to force the friction discs into a tight engagement with each other. The member 215 is provided with coaxial portions 217, 218 the latter of which is the smaller and also internally threaded. Threaded into the portion 218 is a member 219 and this member carries a shoulder 220 against which an annulus 221 forming a part of a ball bearing rests. Between the member 221 and a corresponding member 222 a series of balls 223 are arranged. The member 222 engages a sleeve like collar member 224 which is slidable along the reduced portion 218 of the member 215. Be-

' tween the member 224 and the portion 216 and surrounding the portion 217 of the member 215 is a heavy spring which is held under a predetermined compression by the threaded engagement of the member 219 with the portion 2180f the member 215. A shaft 230 extends completely through a bore within the member 196 and is provided with handles 231 and 232 at its opposite ends. Pinned to the shaft 230 at either end are members 233 which are threaded into openings 234 in the housing, these members being so threaded that upon rotation of the shaft 230 in one direction both are moved in the same direction.

The mode of operation of this clutching mechanism will be readily apparent from the description given. Assume that the handle 231 is turned in such direction as to cause the member 233 to move toward the left. This will exert pressure upon the member 221 and sufiicient pressure can be exerted upon this member to cause the spring to yield, but thereafter the further compres- 'sion of the spring will not produce a very substantial increase in pressure upon the friction discs so that there is provided a certain fairly definite normal load for the clutches.

The general mode of operation of the machine may now be still further described. The manner of controlling the propulsion mechanism has been described in some detail already,- but brief reference to this is desirable in connection with the further description of the operation of the machine as a whole. Let it be supposed that the machine is at some distance from the point where it is desired to insert a kerf. At such a time, in view of the fact that the machine has to run around the mine, the cutter bar and its supporting parts will be raised a substantial distance above the track so that there may be no interference in going down hill or starting to go up hill. It will be understood that'at this time the machine is being propelled by the sprocket 40 under the control of the frictional mechanism 39. When, however, the machine reaches a point where it is desirableto insert a kerf, the machine will be stopped by unloading the friction mechanism 39, and then the bar will be adjusted to the position in which the kerf is desired. Let it be assumed for the purpose of illustrating the adjustments that it is desired to make the cut near the roof and at a distance above the axis of the armature shaft greater than the distance from the shaft axis in which the bar is carried during running around the mine. The change in distance of the bar from the axial line of the armature shaft or the bodily movement of the bar about this axis may either be made first, but let it be assumed that it is decided to move the bar to the desired distance from the axial line of the armature shaft first.- To accomplish this, the clutch sleeve 169 will be thrown upward so that the teeth 165, 167 will be locked together and as a result the member 160 will be held against rotation and so prevent rotation of the screw 148. Rotation of the nut 147 in the proper direction will move the cutter bar away from the axis of the armature shaft. The motor will accordingly be caused to rotate in the proper direction by proper actuation of any usual suitable reverse switch which, as it may be of any type, is not illustrated herein. After the bar has been moved to the desired distance from the axis of the armature shaft, the clutch 169 will be thrown to its' lower position and the clutch 128 will be thrown to connect the teeth 121 and 122, the handle 134 moved to release the lock element 131, and the clutch 55 or 56 engaged to cause bodily adjustment of the bar about the neck axis. When the machine reaches the proper position the friction clutch will be unloaded, the handle 134 will be moved to throw in the lock, and the clutch element 122 will be thrown back to the position shown in Fig. 8. The bar will then be in the desired plane for making the kerf. The handle 231 or 232, whichever happens to be the more conveniently located, will then be grasped by the operator and turned in the proper direction to cause worm wheel 195 to be connected to theshaft 196 and the bar will then be swung rapidly in a counterclockwise direction.

' sired position is reached, the handle 231 or When the del thrown upward to engage the teeth 172 and .17 5. When the desired depth is reached, the lever 81 will be thrown to neutral position and the machine stopped. The other worm wheel 194 will then be clutched tothe shaft 196 by suitable manipulation of the shaft 230 and the bar will be caused to make a swinging cut, this swinging out being effected while the bar is moving more slowly by reason of the smaller lead of the worm which is then operated. At the end of the swinging cut the shaft 230 will again be moved to a position to unload both clutches which control the worm wheels 194 and 195 and the lever 81 manipulated to cause the machine to be backed out of the coal while making a withdrawing cut, it bein understood that during cutting the sprocket is the one which effects propulsion of the ma chine. After the completion of the cut, it will be evident that the bar may be moved to any desired positionfor transport and the machine propelled around the mine by the proper manipulation of the controlling mechanisms. As, however, these operations will be readily understood from what has already been described, it seems unnecessary to describe them in any detail.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from. its spirit or the scope ofthe appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a mining machine, a cutter bar provided with orbitally moving cutting elements, a screw rotatable on an axis perpendicular thereto and constituting means for effecting orbital movement of said cutting elements, and means adapted to cooperate with said screw to effect movement of said barbodily by power in a direction in. which said screw extends.

2. In a mining machine, a cutter bar, a screw rotatable on an axis perpendicular thereto and constituting bar actuating means, and means adapted to cooperate with said screw to effect movement of said screw and of said bar bodily by power in a direction in which said screw extends.

3. In a mining machine, a cutter chain carrying cutter bar, a member rotatable on an axis perpendicular thereto and constituting chain actuating means, and means adapted to cooperate directly therewith at the will of an operator to move said bar by power rectilinearly in the direction in which the axis of said member extends throughout such movement.

4. In a mining machine, a cutter chain carrying cutter bar, a member rotatable on an axis perpendicular thereto and constituting chain actuating means, and means adapted to cooperate directly with said member at the will of an operator to move said member and said bar by power rectilinearly in the direction in which said member extends throughout such movement.

5. In a mining machine, a cutter chain carrying cutter bar, a screw rotatable on an axis perpendicular thereto and constituting chain actuating means, and means adapted to cooperate directly therewith at the will of an operator to move said bar by power in the direction in which said screw extends.

6. In a mining machine, a cutter chain carrying cutter bar, a screw rotatable on an axis perpendicular thereto and constituting chain actuating means, and means adapted to cooperate directly therewith at the will of an operator to move said screw and said bar by power in the direction in which said screw extends.

7. In a mining machine, a cutter bar, actuating means therefor including a driving shaft, and means for adjusting the same and said bar by power rectilinearly to difierent positions parallel to lines parallel to their original positions including cooperating means coaxial with said shaft.

8. In a mining machine, a cutter bar, a bar actuating element, a screw coaxial therewith and driving the same, and nut means cooperable with said screw to effect adjustment by power of said bar to a different position parallel to its first position.

9. In a mining machine, a cutter bar, a bar actuating element, a screw coaxial therewithrand driving the same, and nut means cooperable' with said screw to effect adjustment of said bar to a different position-parallel to its first position, said screw being rotatable with said nut means or adapted to be held stationary to cause such adjustment by power.

10. In a mining machine, a cutter bar, a bar actuating element, a screw coaxial therewith and driving the same, a nut, said screw being rotatablewith said nut or adapted to be held stationary, and means for holding said screw stationary.

11. In a mining machine, a cutter bar, a bar actuating element, a screw coaxial therewith and driving the same, a nut, said screw being adapted to be held in non-rotatable relation with said nut or to be held stationary, and means for holding said screw stationary.

12. In a mining machine, a cutter bar, a bar actuating element, a screw coaxial therewith and driving the same, a neck, members cooperating with said screw to support and at the will of the operator move said tool on said neck at right angles to and toward and from the axial line of said mechanism in any position thereof. about said neck, and means including means extending along the axial line of said neck for actuating said screw.

13. In a mining machine, a bar, and bar swinging mechanism including a shaft perpendicular to the plane ofswing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means respectively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse shaft extending between said first mentioned and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and plural set worm driving means between said first mentioned shaft and said transverse shaft.

14. In a mining machine, a bar, and.bar swinging mechanism including a shaft perpendicular to the plane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means respectively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse lying shaft between said first and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and fast and slow worm driving means comprising se 'arate fast and slow worms between said rst mentioned shaft and said transverse shaft.

15. In amining machine, a bar, and bar swinging mechanism including a shaft .perpendicular to theplane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means respectively connected to said bar and said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse shaft between said first mentioned and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and worm driving means between said first mentioned shaft and said transverse shaft, including worms rotating on axes parallel to and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft.

16. In a mining machine, a bar, and bar swinging mechanism including a shaft perpendlcular to the lane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means selectively connected to said bar and to said second mentioned shaft whereby. on rotation of' said second mentioned shaft said bar is swung, a transverse shaft between said first mentioned and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and worm driving means between said first mentioned shaft and said transverse shaft including worms of different pitch rotating on axes parallel to and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft.

17. In a mining machine, a bar, and bar swinging mechanism including a shaft perpendicular to the plane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means o'pe ratively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, atransverse shaft between said first mentioned and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and worm driving means between said first mentioned shaft and said transverse shaft including worms rotating on axes parallel to and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft,

and friction means for connecting either of said worm wheels to said shaft.

18. In a mining machine, a bar, and bar' swinging mechanism including a shaft perpendicular to the plane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means respectively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse shaft between said first mentioned and second mentioned shafts, Worm driving means between said transverse shaft and said sec ond mentioned shaft, and worm driving means between said first mentioned shaft and said transverse shaft including worms of different pitch rotating on axes parallel to and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft, and friction means having substantially limited power transmitting capacity arranged between said worm wheels and said shaft.

19. In a mining machine, a bar, and bar swinging mechanism including a shaft perpendicular to the plane of swing of the bar arranged at the pivot of .the bar, a second shaft arranged in fixed spaced relation to the bar and parallel to said first mentioned shaft, means operatively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse shaft between said first mentioned and second mentioned shaft-s, worm driving means between said transverse shaft and said second mentioned shaft, and Worm driving means between said first mentioned shaft and said transverse shaft including worms rotating on axes of different pitch parallel to and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft, and friction means arranged between said worm wheels and said shaft, and means coaxial with said shaft for controlling the loading of said frictions.

20. In a mining machine, a bar, and bar swinging mechanism including a shaft perpendicular to the plane of swing of the bar arranged at the pivot of the bar, a second shaft arranged in fixed spaced relation to the barand parallel to said first mentioned shaft, means respectively connected to said bar and to said second mentioned shaft whereby on rotation of said second mentioned shaft said bar is swung, a transverse shaft between said first mentioned and second mentioned shafts, worm driving means between said transverse shaft and said second mentioned shaft, and worm driving means between said first mentioned shaft and said transverse shaft including worms rotating on axes of different pitch parallel to :and at opposite sides of said first mentioned shaft and worm wheels coaxial with said transverse shaft, and friction means arran ed between said worm wheels and said shaft, and means coaxial with said shaft for controlling the loading of said frictions and including a shaft extending through said transverse shaft.

21. In a mining machine, the combination with a pivoted cutter bar and a driving motor therefor, of means for swinging said cutter bar'in opposite directions at different speeds by power including a rotatable memher to which said bar is connected, and means including arallel shafts parallel to the bar pivot an rotating at equal speeds operatively connectible in driving relation with said rotatable member to swing said bar at different speeds.

22. In a mining machine, the combination with a pivoted cutter bar and a driving motor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable memher to which said bar is connected, and means including parallel shafts parallel to the bar pivot and rotating at equal speeds, and different gear reductions driven thereby operatively connectible in driving rela-- tion with said rotatable member to swing said bar at different speeds.

23. In a'mining machine, the combination with a pivoted cutter bar and a driving mo-, tor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of the latter, and means including parallel shafts parallel to the bar pivot and'rotating at equal speeds operatively connectible in driving relation with said rotatable member to swing said bar at difl'erent speeds.

24. In a mining machine, the combination with a cutter bar and a driving motor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of the latter, and means including parallel shafts parallel to the axis of said driving member and rotating at equal speeds and different gear reductions driven thereb operatively connectible in driving relation with said rotatable member to swing said bar at different speeds.

25. In a mining machine, the combination with a cutter bar and a driving motor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of-the latter, and means including parallel shafts parallel to the axis of said driving member and rotating at equal speeds operatively connectible in driving relation with said rotatable member to swing said bar at different speeds, and means manually operable to effectsuch connections but not simultaneously.

26. In a mining machine, the combination with a cutter bar and a driving motor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of the latter, and means including parallel shafts parallel to the axis of said driving member and rotating at e ual speeds and different gear reductions driven thereby o eratively connectible in driving relation wit said rotatable member to SWlIlg said bar at different speeds, and means manually operable to effect such connections but not simultaneously.

27. In a mining machine, the combination with a cutter bar and a driving motor therefor, of means for swingin said cutter bar in opposite directions at diflerent speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of the latter, and means including parallel shafts parallel to the axis of said driving member and rotating at equal speeds operatively connectible in driving relation with said rotatable member to swing said bar at different speeds, and means manually operable to effect such connections but not simultaneously, said means being provided with operating ele ments arranged. at either side of the cutter bar in the median position of the latter.

28. In a mining machine, the combination with a cutter bar and a driving motor therefor, of means for swinging said cutter bar in opposite directions at different speeds by power including a rotatable member by which said bar is carried, a driving member for said rotatable member rotating on an axis parallel to the axis of the latter, and means including parallel shafts parallel to the axis of said driving member and rotating at equal speeds and different gear reductions driven thereby operatively connectible in driving relation with said rotatable member to swing said bar at different speeds, and means manually operable to effect such connections but not simultaneously, said means being provided with operating eleinents arranged at either side of the cutter 29. In a mining machine, the combination with a machine frame, a pivoted plane cutter and a driving motor therefor, of means for supporting said cutter on said frame permitting angular bodily adjustment thereof about an axis extending longitudinally of said frame, said cutter being adapted to cut in planes parallel to the axis of said adjustment and being adjustable by power from said motor rectilinearly toward and from said axis while its plane remains perpendicular to the path of rectilinear adjustment and being swingable at different rates in opposite directions about its pivot.-

30. In a mining apparatus, a wheel -mounted truck, a mining machine on said truck, said truck "including a portion arranged to permit tiltin of said mining machine relative to anot er portion of said truck, a chain drive for said truck including a chain loop operatively connected to at least one truck wheel, a plurality of driving sprockets projecting laterally from said machine and engaging with said loop, and means for tightening and loosening said chain carried, independently of the tilting portion, directly by the portion of said truck which does not tilt.

31. In a mining apparatus, a wheel mounted truck, a mining machine on said truck, means permitting tilting of said mining machine relatlve to a portion of said truck, a chain drive for said truck including a chain loolp operatively connected to at least one true wheel, a plurality of driving sprockets projecting laterally from said machine and engaging with said loop, and means for tightening and loosening said chain including a rotatably mounted chain guiding element and means for supporting the same for swinging movement relative to said truck about an axis which is different from the axis of tilt of said machine and which axis remains stationary during machine tilting. g

32. In a mining apparatus, a wheel mounted truck, a mining machine on said truck, means permitting tilting of-said mining machine relative to a portion of said truck, a chain drive for said truck including a chain loop operatively connected to at least one truck wheel, a plurality of driving sprockets projecting laterally from said machine and engaging with said loop, and. means for preventing breakage of said chain on tilting of said machine including a member moved automatically, independently of the tension of said chain, relative to said machine on tilting of the latter.

33. In a mining apparatus, -a wheeled truck, a mining machine thereon, said machine comprising a body and a plane pivoted cutter bar adjustable bodily relative to said machine and also mounted for swinging movement in its own plane, a flexible truck driving connection between said mining machine and a wheel of said truck, means for tilting said body on said truck to give said bar an upward -or downward inclination, and slack-control means cooperating with said flexible'connection moving in predetermined relation with said last mentioned means.

34. In a mining apparatus, a wheeled truck frame, a mining machine pivotally supported on said truck frame, a flexible driving connection between said mining machine and truck wheel, means for tilting said machine upon a frame including a horizontal shaft parallel to the axis of tilting and mounted on said frame, lever moans secured to said shaft engaging the mining machine, lever. meanson said shaft for turning the same, and lever means also carried by said shaft and carrying an idler element about which said flexible connection passes.

35. In a mining apparatus, a wheeled truck frame, a mining machine, pivotally supported on said truck frame, a flexible driving connection between said minin machine and a truck wheel, means for tilting said machine upon a frame includin a horizontal shaft parallel to the axis 0 tilting and mounted on said frame, lever means secured to said shaft engaging the mining machine, lever means on said shaft for turning the same, means carried on said machine for applying force to said lever, and lever means also carried by said shaft and carrying an idler clement about which said flexible con-' nection passes.

' machine, lever means on said shaft for turning the same, means carried on said machine for applying force to said lever, said last mentioned means comprising a screw operatively connected to said lever and a manually rotatable nut carried by said machine, and lever means also carried by said shaft and carrying an idler element about which said flexible connection passes.

37. In a mining apparatus, a wheeled truck frame, a mining machine pivotally supported on said truck frame, a flexible driving connection between said minin machine and a truck wheel, means for tllting said machine upon a frame includin a horizontal shaft parallel to the axis 0 tilting and mounted on said frame, lever meanscarrying an idler element about which said flexible connection passes.

38. In a mining machine including a cutter bar and a machine frame, a hollow shaft extending transversely of said frame, a pair of worm wheels rotatably mounted in coaxial relation to said shaft and between the ends of the latter, friction clutch means load-' able to connect either of said worm wheels to said shaft, and friction clutch controlling means including a member accessible for operation from either end of said shaft and disposed within said shaft and means for loading said frictions controlled by the position of said member.

39. In a mining machine, a chain carrying cutter bar; actuating means therefor including a chain driving sprocket and a shaft coaxial therewith, and means for adjusting the bar rectilinearly by power through a 1 series of parallel positions while said shaft remains parallel to a single straight line including cooperating adjusting means coaxial with said shaft.-

40. In a mining machine, a chain carrying cutter bar, actuating means therefor includ-. ing a chain driving sprocket and a shaft coaxial therewith, and means for adjusting said shaft and said bar by power through a series of parallel positions while said shaft remains parallel to a single straight line including cooperating means coaxial with said shaft.

. rotatable on an axial bar actuating and bar adjusting means,

43. In a mining machine, a bar, a machine frame, supporting means permitting bodily movement of said bar about a longitudinal .axis and swing of said bar, and power means for actuating said bar and for adjusting a portion of said supporting means rectilinearly towards and from said axis including coaxial bar actuating and bar adjusting means axis perpendicular to the I 44. In a mining machine, a bar, a machine frame, supporting means permitting bodily movement of said bar about a longitudinal axis and swing of said bar, and power means for actuating said bar and for adjusting a portion of said supporting means rectilinearly towards and from said axis including coaxial bar actuating and bar adjusting means rotatable on an axis perpendicular to 1 the bar and coincident with its axis of swing.

45. In a mining machine, a support, a cutter bar, and power means for actuating said bar, swinging the same about an axis perpendicular thereto, moving the same bodily about an axis perpendicular to said first mentioned axis, and moving the same rectilinearly towards and from said second mentioned axis While maintaining said first mentioncd axis, during such rectilinear movement, parallel toa line parallel to it at the start of such movement, and means for tilting said support about a transverse axis.

46. In a mining machine, a cutter bar, actuating means therefor including a driving shaft, and means for adjusting the same and said bar rectilinearly by power to different positions parallel to lines parallel to their original positions including means coaxial with said shaft and cooperating therewith to effect suchadjustment.

47. In a mining machine, a chain carrying cutter bar, actuating means therefor including a chain driving sprocket and a shaft coaxial therewith, and means for adjusting the bar rectilinearly by power through a series of parallel positions including coacting adjusting means coaxial with said shaft and cooperating therewith to effect such adjustment. i

48. In a mining machine, a chain carrying cutter bar, actuating means therefor including a chain driving sprocket and. a shaft co axial therewith, and means for adjusting said shaft and said bar by power rectilinear- 1y through a series of parallel positions including means coaxial-with said shaft and cooperating therewith to effect such adjustments.

49. In a mining apparatus, coaxial motor driven cutting mechanism adjusting and actuating means.

50. In a mining machine, a motor, a neck, cutting mechanism supported thereby and adjustable rectilinearly in a radial direction towards and from the axis of said neck, said cutting mechanism including orbitally movable cutting elements whose orbit maintains, during rectilinear radial adjustment of the cutting mechanism, a uniform angular relation to the direction of such adjustment, means for effecting orbital movement of said cutting elements, and means driven by said motor for effecting such adjustment including a member rotatable on an axis perpendicular to the axis of said neck.

51. In amining machine, cutting mechanism, a screw perpendicular thereto and constituting actuating means therefor, a neck,

members cooperating with said screw to sup port and at the will of the operator move said cutting mechanism at right angles to and towards and from the axial line of the neck, and means extending through said thereto and constituting actuating mechanism therefor for effecting orbital movement of said cutting elements, members cooperating with said screw to support and at the will of the operator move said cutting mechanism in either direction-in a path parallel to the axis of said screw, and swinging means for said cutting mechanism movable therewith during its movements in such path.

54. In a mining machine, a support, cutting .mechanis m including orbitally movable cutting elements, a screw perpendicular thereto and constituting actuating mechanism therefor for effecting orbital movement of said cutting elements, members cooperating with said screw to support and at the will of the operator move said cutting mechanism in either direction in'a path parallel to the axis of said screw, and swinging means for said cutting mechanism actuated by said screw and movable with said cutting mechanism during its movements in such paths.

55. In a mining machine, a support cutting mechanism, a screw perpendicular thereto and constituting actuating mechanism therefor, members cooperating, with said screw to support and at the will of the operator move said cutting mechanism and screw in either direction in a path parallel to the axis of said screw, and swinging means for said cutting mechanism movable therewith during its movements in such path.

56. In a mining machine, a support, cutting mechanism, a screw perpendicular thereto and constituting actuatin mechanism therefor, members cooperating with said screw to support and at the will of the operator move said cutting mechanism and screw in either direction in a path parallel to the axis of said screw, andswinging means for said cutting mechanism actuated by said screw and movable with sald cutting mechanism during its movements in such paths.

57. In a mining machine, cutting mechanism. a screw perpendicular thereto and constituting actuating means therefor, a neck, members cooperating with said screw to support and at the will of'the operator move said cutting mechanism at right angles to and towards and from the axis of said neck, means for rotating said neck, and swinging means for said cut-ting mechanism movable therewith during its movement towards and from the neck axis,

58. In a. mining machine, cutting mechanism, a screw perpendicular thereto and constituting actuating means therefor, a neck, members cooperating with said screw to support and at the will of the operator move said cutting mechanism at right angles to and towards and from the axis of said neck, means for rotating said neck, and swinging meansfor said cutting mechanism actuated by saidv screw movable therewith during its movements towards and from the neck axis.

59. In a mining machine, cutting mechanism, a screw perpendicular thereto-and constituting actuating means therefore, a neck, members cooperating with said screw to support and at the will of the operator move said cutting mechanism and screw at right angles to and towards and from the axis of said neck, and swinging means for said cutting mechanism movable therewith during its'movement towards and from the neck axis.

60. In a mining machine, cutting mechanism, a screw perpendicular thereto and constituting actuating means therefor, a neck, members cooperating with said screw to support and at the will of the operator move said cutting mechanism and screw at'right angles to and towards and from the axis of said neck, means for rotating said neck, and swinging means for said cutting mechanism actuated by said screw movable therewith during its movements towards and from the neck axis.

61. In a mining machine, cutting mechanism, mutually engaging screw and nut elements, driving connections between one of said elements and said cutting mechanism, means for rotating the other of said elements, and means for selectively connecting the first element to the second for rotation therewith or holding the same against rotation.

62. In a mining machine, cutting'mechanism, mutually engaging screw and. nut elements, driving connections between one of said elements and said cutting mechanism, and means for rotating said elements simultaneously or one while the other remains stationary.

63. In a mining machine, a cutter bar provided with orbitally movable cutting elements, a single member rotatable on an axis perpendicular thereto and constituting means for transmitting power to said cutting elements to cause orbital movement thereof, and means adapted to cooperate directly with said member at the will of an operator to effect movement thereof and of said bar by power rectilinearly in the direction in which said member extends.

64:. In a mining machine, a cutter bar provided with orbitally movable cutting elements guided in a plane orbit, a member rotatable on an axis perpendicular to the plane of said orbit and constituting means for transmitting power to said cutting elements to cause orbital movement thereof, said member being rotatable on an axis in a line intersecting the plane of the orbit of said cutting elements within the orbit, and means adapted to cooperate directly with said member at the will of an operator to move said bar by ower rectilinearly in the direction in whlch said member extends while the orbit of the cutting elements remains constantly parallel to'a plane perpendicular to said direction of rectilinear movement.

65. In a mining machine, a cutter bar provided with orbitally' movable cutting elements, a member rotatable on an axis perpendicular thereto and constituting means for transmitting power to said cutting elements to cause orbital movement thereof, said member being rotatable on an axis in a line intersecting the plane of the orbit of said cutting elements within the orbit, and means adapted to cooperate directly with said member at the will of an operator to effect movement thereof and of said bar by power rectilinearly in the direction in which said member extends.

66. In a mining machine, a cutter bar,

actuating means therefor including a driving shaft, and means for adjusting the bar by power to different parallel positions including cooperating means coaxial withsaid shaft, one of said means being arranged to hold'said shaft against rotation to effect such adjustment.

67. In a mining machine, a motor, a cutter bar, actuating means therefor driven by said motor including a driving shaft, and means for adjusting the same and said bar rectilinearly by power to different positions parallel to lines parallel to their original positions including cooperating adjusting means coaxial withsaid shaft.

68. In a mining machine, a cutter bar, and bar supporting and adjusting means including a member rotatable at all times when said bar is actuated, and a cooperating member arranged to be held stationary to effect bar adjustment, and means coo erating di rectly with said first mentione member to support and adjust said cutter bar by power.

69. In a mining machine, coaxial power operated bar plane adjusting and bar. actuating means, said means being alternatively operable.

70 In a mining machine, a cutter bar, actuating means therefor including a driving shaft, and means for adjusting said bar by power to different parallel positions including cooperating means coaxial with said shaft, said coaxial means including an element arranged to be held stationary to efifect such adjustment.

71. In a mining machine, a plane cutter bar, actuating means therefor including a final driving shaft, and means for adjusting said bar rectilinearly by power to different parallel positions to which it remains parallel during its adjustment including coacting adjusting means coaxial with said shaft and cooperating therewith to effect such adjustment.

72. In a mining machine, a cutter bar having orbitally movable cutting elements movable in a plane orbit, actuating means therefor including a driving shaft disposed on an axis in a line intersecting the plane of the orbit of said cutting elements within the orbit, and means for adjusting said bar rectilinearly by power to different parallel positions to which it remains parallel during its adjustment including coacting adjusting means coaxialwith said shaft and cooperating directly therewith to effect such adjustment.

73. In a mining apparatus, coaxial power operated cutting mechanism adjusting and actuating means, saidmeans being alternatively operable.

74. In a mining machine, a motor, a cutter bar provided with orbitally movable cutting elements, mechanism driven by said motor including a member rotatable on an axis perpendicular thereto and constituting means for effecting orbital movement of said cut- ,ting elements, and means adapted to cooperate directly with said member at the will of an operator to effect movement thereof able about a longitudinal axis and a pivot-- ed kerf cutter mounted on said head for adjustment toward and from the head axis, and motor operated devices for adjusting said kerf cutter toward and from the head axis including cooperating screw and nut elements, and means for rotating one of said elements while the other is held against rotation.

76. In a mining machine, a portable base, kerf cutting mechanism mounted on said base including a cutter carrying head rotatable about a longitudinal axis and a pivoted kerf cutter mounted on said head for adjustment toward and from the head axis, and motor operated devices for adjusting said kerf cutter toward and from the head axis including cooperating screw and nut elements, andmeans for rotating said nut element while said screw is held against rotation.

77. In a mining machine, a portable base, kerf cutting mechanism mounted thereon including a cutter carrying head rotatable about a longitudinal axis, a guidewayon said head arranged perpendicularly to said head axis and a pivoted-kerf cutter mounted on said guideway for adjustment toward and from the head axis, and motor operated devices for adjusting said kerf cutter along said guideway toward and from the head axis; including cooperating relatively rotatable screw and nut elements, and means for rotating one of said elements while the other is held against rotation.

'78. In a mining machine, a portable base, kerf cutting mechanism mounted thereon including a cutter carrying head rotatable about a longitudinal axis, a guideway 011 said head arranged perpendicularly to said head axis and a pivoted kerf cutter mounted on said guideway for adjustment toward and from the head axis, and motor operated devices for adjusting said kerf cutter along said guideway toward and from the head axis including cooperating relatively rotatable screw and nut elements, means for rotating said nut element while said screw is held against rotation.

79. In a mining machine, a portable base, kerf cutting mechanism mounted on said base including a cutter carrying head rotatable about a longitudinal axis, a guideway on said head arranged perpendicularly t: the head axis and a pivoted kerf cutter 

